Allows you to apply a Netfilter mark value to packets being transmitted
	on the client-side, based on an ACL.

	clientside_mark mark-value [!]aclname ...

	Example where normal_service_net uses the mark value 0x00
	and good_service_net uses 0x20

	acl normal_service_net src 10.0.0.0/24
	acl good_service_net src 10.0.1.0/24
	clientside_mark 0x00 normal_service_net
	clientside_mark 0x20 good_service_net

	Note: This feature is incompatible with qos_flows. Any mark values set here
	will be overwritten by mark values in qos_flows.

	This clause only supports fast acl types.
	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.